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Push-ups. To strengthen his arm and chest muscles, an 82 kg athlete 2.0 m tall is doing a series of push-ups as shown in Figure $10.58 .$ His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 $\mathrm{cm}$ from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise. Begin with a free-body diagram of the athlete.

$\approx{ 2 7 2 \mathrm { N } }$$= { 1 3 0 \mathrm { N } }$

Physics 101 Mechanics

Chapter 10

Dynamics of Rotational Motion

Newton's Laws of Motion

Rotation of Rigid Bodies

Equilibrium and Elasticity

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

University of Winnipeg

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who in problem number 39 we have a athlete doing the push up. Our fleet is two meters tall and his weight. Where's masses? 82 kilograms and it's located center Mass is located 1.15 from his feet. So at 82 kilograms, that makes his weight. 803.6 Newtons. Now he has two hands. Here are two feet. Sorry. So we're gonna call this his force of his feet and he has two hands located here. They would like to know the force of his feet on. Find the force on each foot and on each Hagen. That's assuming that they, each hand and foot are exert equal forces. So we're gonna look at this two ways. First, we're gonna look at the some of the torques we know those air zero. Yeah. We're gonna look at the sum of our forces in the UAE direction and we know those air zero. No, looking at our talks to begin with, we know for pivoting a defeat. We know that that lever arm zero. So we have two forces that provide torque. It's the weight in the hands. Okay, So our weight 803 0.6. It's lever arm. 1.15 would equal the Twerk, you know, doing both hands that they're too f ages. And that is located 1.7 from the pivot on solving this Ferrari. I'm sorry for F h. We get each hand is supporting 272 mutants. We're here looking at our forces in the direction. We would know that two feet and two, it was two hands. We're gonna have to hold up his weight of 803.6. We do now. Already. Our hands force of 2 72 substituting in in solving four feet. What would have to support 100 and 30? It's Thank you for

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